We live in a superconnected world, where 1.3 million Android devices are activated a day, and it is becoming more usual to see users with one or even more Android devices. Seamlessly sharing data between devices might be what differentiate your app among its competitors! Find out the potential you can unveil by getting the most of NFC, Bluetooth or WiFi Direct APIs.

1. SUPERIORIDAD AÉREA
EN APLICACIONES ANDROID
Saúl Díaz González
saul@tuenti.com

2. Wi-Fi 802.11 N
Near-Field Comm.
Bluetooth 3.0 + HS

3. “¿Cómo mejorarlo? Le pondremos Bluetooth. ¡Todo es mejor
con Bluetooth!”
-Sheldon Cooper

4. Búsqueda
Descubrimiento
Conectar
Aceptar
¡Emparejados!

5. Clases clave
Descubrir
Bluetooth Bluetooth
Adapter Device
Bluetooth
Crear
Adapter
Conectar Bluetooth
Bluetooth
Aceptar Server
Socket
Socket

6. Activando el Bluetooth
BLUETOOTH
BLUETOOTH_ADMIN
mBtAdapter =
BluetoothAdapter.getDefaultAdapter();
mBtAdapter == null?
Si
Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(intent, REQUEST_ENABLE_BT);

7. Descubrimiento
Cliente Servidor
Intent(BluetoothAdapter.
mBtAdapter.startDiscovery(); ACTION_REQUEST_DISCOVERABLE);
Intent.putExtra(BluetoothAdapter.
EXTRA_DISCOVERABLE_DURATION,
300);
IntentFilter(BluetoothDevice.
ACTION_FOUND);
registerReceiver(mReceiver,
filter);
intent.getParcelableExtra(
BluetoothDevice.EXTRA_DEVICE);

8. Conexión
Cliente Servidor
btDevice. mBtAdapter.
createRfcommSocketToServiceRecord( listenUsingRfcommWithServiceRecord(NAME,
MY_UUID); MY_UUID);
clientSocket.connect(); serverSocket.accept();
in = socket.getInputStream();
out = socket.getOutputStream();
in.read(buffer) //Buffer is byte[]
out.write(buffer)

9. “Cualquier tecnología lo suficientemente avanzada es
indistinguible de la magia”
-Arthur C. Clarke

10. NFC Tag
Write Read
Android Beam

11. NFC Data Exchange Format (NDEF)
Record1 Record2 ... RecordN
Header Payload
Identifier Length Type

12. Requisitos NFC
Uses Permission Intent Filter
NFC android.nfc.action.NDEF_DISCOVERED

13. Leer un mensaje NDEF
public void onNewIntent(Intent intent) {
if (NfcAdapter.ACTION_NDEF_DISCOVERED.
equals(intent.getAction())) {
Parcelable[] rawMsgs = intent.
getParcelableArrayExtra(
NfcAdapter.EXTRA_NDEF_MESSAGES);
NdefMessage[] msgs;
if (rawMsgs != null) {
msgs = new NdefMessage[rawMsgs.length];
for (int i = 0; i < rawMsgs.length; i++) {
msgs[i] = (NdefMessage) rawMsgs[i];
}
}
//Process Messages
}
}

14. Opciones de dispatching
Classic Intent NFC Foreground Android App
Dispatch Dispatch Record
mNfcAdapter.
enableForegroundDispatch(
...);
NdefRecord.
createApplicationRecord(
“com.example.nfc.beam”);
mNfcAdapter.
disableForegroundDispatch(
this);

15. Escribir en una Tag
private void write(Tag tag) throws IOException,
FormatException {
NdefRecord[] records = { createRecord() };
NdefMessage message = new NdefMessage(records);
// Get an instance of Ndef for the tag.
Ndef ndef = Ndef.get(tag);
// Enable I/O
ndef.connect();
// Write the message
ndef.writeNdefMessage(message);
// Close the connection
ndef.close();
}

16. Android Beam
public class BluetoothChat extends Activity implements
CreateNdefMessageCallback{
@Override
public NdefMessage createNdefMessage(NfcEvent event) {
try {
NdefRecord[] records = { createRecord() };
NdefMessage message = new NdefMessage(records);
return message;
} catch (UnsupportedEncodingException e) {
//Handle error here
}
return null;
}

17. Demo time!

18. “Chuck Norris puede estrangular a un hombre con el cable
de una conexión Wi-Fi.”
-Proverbio chino

19. 200x
28x
12x
1x
BT 2.1 BT 3.0+HS WiFi 11g WiFi 11n

20. Peers
Group Owner

21. Requisitos Wi-Fi Direct
Ice Cream Permisos
Sandwich
ACCESS_WIFI_STATE
CHANGE_WIFI_STATE
CHANGE_NETWORK_STATE
INTERNET
ACCESS_NETWORK_STATE

22. Con un receiver voy sobrado
WIFI_STATE_CHANGED_ACTION WIFI_P2P_PEERS_CHANGED_ACTION
WIFI_P2P_CONNECTION_CHANGED_ACTION WIFI_P2P_THIS_DEVICE_CHANGED_ACTION

23. Y esto es todo lo que hay que saber
Listener Métodos Eventos
connect(), onSuccess()
ActionListener
cancelConnect(),... onFailure()
ChannelListener initialize() onChannelDisconnected()
ConnectionInfoListener requestConnectInfo() onConnectionAvailable()
GroupInfoListener requestGroupInfo() onGroupInfoAvailable()
PeerListListener requestPeers() onPeersAvailable()

24. ¡Peer a la vista!
mManager = (WifiP2pManager)
getSystemService(Context.WIFI_P2P_SERVICE);
mChannel = mManager.initialize(this, getMainLooper(), null);
mReceiver = new WiFiDirectBroadcastReceiver(mManager,mChannel,this);
mManager.discoverPeers(channel, new WifiP2pManager.ActionListener() {
@Override
public void onSuccess() {
//success logic
}
@Override
public void onFailure(int reasonCode) {
//failure logic
}
});

25. Mientras en el receiver...
if (WifiP2pManager.WIFI_P2P_PEERS_CHANGED_ACTION.equals(action)) {
if (mManager != null) {
mManager.requestPeers(mChannel, new PeerListListener(){
@Override
public void onPeersAvailable(WifiP2pDeviceList list) {
//Update Peer List, data model, etc...
}
});
}
}

26. Frecuencias de llamadas abiertas
WifiP2pDevice device = new WifiP2pDevice();
WifiP2pConfig config = new WifiP2pConfig();
config.deviceAddress = device.deviceAddress;
mManager.connect(mChannel, config, new ActionListener() {
@Override
public void onSuccess() {
//ready for connecting through a socket
}
@Override
public void onFailure(int reason) {
//failure logic
}
});

27. Superioridad aérea
Sencillo
Mágico

28. ¡Muchas gracias!
Saúl Díaz González
saul@tuenti.com
@sefford